diff --git a/lib/isc/pthreads/thread.c b/lib/isc/pthreads/thread.c
index f8029e26ed..94801d5085 100644
--- a/lib/isc/pthreads/thread.c
+++ b/lib/isc/pthreads/thread.c
@@ -23,7 +23,7 @@
 #include <sys/cpuset.h>
 #endif
 
-#if defined(HAVE_SYS_PROCESET_H)
+#if defined(HAVE_SYS_PROCSET_H)
 #include <sys/types.h>
 #include <sys/processor.h>
 #include <sys/procset.h>